CUSTOMER/OPERATOR SERVICE 46 Manual 0-2470
5.03 GENERAL TORCH MAINTENANCE (continued)
Checking the
Center Insulator
WARNING
WARNING
The center insulator separates the negative and positive charged
sections of the torch. If the center insulator does not provide
adequate resistance, current which is intended for the pilot arc
may be dissipated into the torch head, resulting in torch failure.
Disconnect primary power to the system before disassembling
the torch, leads, or power supply.
DO NOT touch any internal torch parts while the AC indicator
light on the front panel of the power supply is lit.
Refer to Figure 5-A (page 44) and:
1. Remove the shield cup, tip, gas distributor, and electrode
from the torch. Disconnect the torch leads from the power
supply to isolate the torch from power supply circuits.
2. Using an ohmmeter (set to 10K or higher), check for continu-
ity between the positive and negative torch quick disconnect
fittings. Infinite resistance (no continuity) should be found. If
continuity is found, refer to Torch and Leads Troubleshooting
(page 56).
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